Render :emojicode: as the corresponding emoji in markdown preview

[jansol]

Check for existing issues

• Completed

Describe the feature

A number of projects on github use emojis in their README, often to keep feature support tables to a manageable size. Often they also use Github's :emojicode: syntax for them. It would be nice if Zed's markdown preview would render the :emojicode: syntax as the corresponding emoji.

The full list used by Github is available here: https://github.com/ikatyang/emoji-cheat-sheet/blob/master/README.md
The majority is standard Unicode emoji, but there are a few Github-specific custom emoji as well -- I'm not sure if supporting those is worth the added complexity of fetching them from the Github API every time, and as they are Github-specific, they would likely cause confusion in projects hosted elsewhere.

Environment

N/A

If applicable, add mockups / screenshots to help present your vision of the feature

No response

[JosephTLyons]

Seems reasonable to at least support the standard emoji codes here and gauge interest in the rest after.

[notpeter]

Note, there Github's Emojicode syntax is distinct from the identically named Emojicode programming language.

There is a JSON of current Github emojicodes available here:
https://api.github.com/emojis

One could easily parse this:

{
  "+1": "https://github.githubassets.com/images/icons/emoji/unicode/1f44d.png?v8",
  "-1": "https://github.githubassets.com/images/icons/emoji/unicode/1f44e.png?v8",
  "100": "https://github.githubassets.com/images/icons/emoji/unicode/1f4af.png?v8",
  "1234": "https://github.githubassets.com/images/icons/emoji/unicode/1f522.png?v8",

To extract the utf-8 values:

# curl -s https://api.github.com/emojis | sed -E 's|"(https://.*/)([^/]+)\.png.*"|"\2"|g' 

{
  "+1": "1f44d",
  "-1": "1f44e",
  "100": "1f4af",
  "1234": "1f522",

[notpeter]

No need to reinvent the wheel.
There's actually an existing rust emojis crate which might be suitable.